diff --git a/usr.bin/top/machine.c b/usr.bin/top/machine.c
index 374c9da0edf4..8c0db365f8a5 100644
--- a/usr.bin/top/machine.c
+++ b/usr.bin/top/machine.c
@@ -1276,6 +1276,12 @@ static int sorted_state[] = {
 		return (diff > 0 ? 1 : -1); \
 } while (0)
 
+#define ORDERKEY_PID(a, b) do { \
+	int diff = (int)b->ki_pid - (int)a->ki_pid; \
+	if (diff != 0) \
+		return (diff > 0 ? 1 : -1); \
+} while (0)
+
 /* compare_cpu - the comparison function for sorting by cpu percentage */
 
 static int
@@ -1420,6 +1426,24 @@ compare_swap(const void *arg1, const void *arg2)
 	return (0);
 }
 
+/* compare_processid - the comparison function for sorting by pid */
+static int
+compare_processid(const void *arg1, const void *arg2)
+{
+	const struct kinfo_proc *p1 = *(const struct kinfo_proc * const *)arg1;
+	const struct kinfo_proc *p2 = *(const struct kinfo_proc * const *)arg2;
+
+	ORDERKEY_PID(p1, p2);
+	ORDERKEY_PCTCPU(p1, p2);
+	ORDERKEY_CPTICKS(p1, p2);
+	ORDERKEY_STATE(p1, p2);
+	ORDERKEY_PRIO(p1, p2);
+	ORDERKEY_RSSIZE(p1, p2);
+	ORDERKEY_MEM(p1, p2);
+
+	return (0);
+}
+
 /* assorted comparison functions for sorting by i/o */
 
 static int
@@ -1511,7 +1535,7 @@ int (*compares[])(const void *arg1, const void *arg2) = {
 	compare_ivcsw,
 	compare_jid,
 	compare_swap,
-	NULL
+	compare_processid
 };